package my.suveng.netty.learn.broadcast;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.GlobalEventExecutor;

/**
 * description:
 * 
 * @author suwenguang
 * 
 * @version 1.0.0
 **/
public class BroadcastServerHandler extends SimpleChannelInboundHandler<String> {

    private static final ChannelGroup channelGroup = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
        Channel channel = ctx.channel();

        channelGroup.forEach(ch -> {
            if (ch.equals(channel)) {
                ch.writeAndFlush("[自己]:" + msg + "\n");
            } else {
                ch.writeAndFlush(channel.remoteAddress() + ":" + msg + "\n");
            }
        });
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();

        channelGroup.add(channel);

        channelGroup.writeAndFlush("[服务器]:" + channel.remoteAddress() + "加入");
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();

        channelGroup.writeAndFlush("[服务器]:" + channel.remoteAddress() + "退出");

        channelGroup.remove(channel);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();
        System.out.println(channel.remoteAddress() + "上线了");
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();
        System.out.println(channel.remoteAddress() + "下线了");
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }
}
